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UPSC CDS Math Trigonometric Ratios and Trigonometric Identities Questions
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© examsnet.com
Question : 97
Total: 107
In a right-angled triangle ABC, right-angled at B, if cos A =
4
5
, then what is sin C equal 5to?
[2014 CDS-I]
3
5
4
5
3
4
2
5
Validate
Solution:
In right ΔABC,∠B=90°
∴
∠
A
+
∠
C
=
90
°
Cos
A
=
4
5
⇒
cos
(
90
°
−
C
)
=
4
5
⇒
sin
C
=
4
5
© examsnet.com
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